Dr. Barnaby Fulton (Cary Grant) is experimenting to find a rejuvenation tonic for a drug company and one of his laboratory chimpanzees escapes and mixes a far more effective serum. The chimp’s concoction finds its way into a bottle of drinking water, with chaotic results. Both Barnaby and his wife, Edwina (Ginger Rogers), wash down the tonic with some of the tainted drinking water, without realizing that it is the latter that is causing their subsequent juvenile behavior.
Cast:
Cary Grant as Dr. Barnaby Fulton
Ginger Rogers as Edwina Fulton
Marilyn Monroe as Lois Laurel
Charles Coburn as Oliver Oxley
Hugh Marlowe as Hank Entwhistle
Henri Letondal as Dr. Jerome Kitzel
Robert Cornthwaite as Dr. Zoldeck
Larry Keating as G.J. Culverly
Douglas Spencer as Dr. Brunner
Esther Dale as Mrs. Rhinelander
George Winslow as Little Indian